Leakage testing device for transformer production

Abstract

The utility model relates to the technical field of transformer production testing, in particular to a leakage testing device for transformer production, which comprises an oil inlet mechanism used for supplying insulating oil into a transformer box body, and a pressure gauge used for detecting oil pressure in the transformer box body is arranged on the rear side of the oil inlet mechanism. The sealing mechanism is used for sealing the pressure test opening of the transformer box body, an oil outlet mechanism is arranged on the sealing mechanism, and the oil outlet mechanism and the oil inlet mechanism are symmetrically arranged. The gap between the oil outlet mechanism and the oil inlet mechanism on the sealing disc is sealed through the two first sealing air bags and the two second sealing air bags, so that the situation of insulating oil leakage can be prevented, and after sealing is conducted for a certain time, the liquid level falling situation of the insulating oil in the glass tube and the numerical value change on the pressure gauge are observed. Therefore, whether the transformer box leaks or not is judged.

Description

Technical Field

[0001] The utility model relates to the technical field of transformer production testing, in particular to a leakage testing device for transformer production. Background Art

[0002] After searching the patent with the announcement number CN 210834051 U, the second connecting pipe is disassembled, and then the threaded joint is tightened on the pressure test port of the transformer box with a wrench to seal the transformer pressure test port, and then the corresponding insulating oil is fed into the transformer box, and the valve is closed when the insulating oil flows out from the overflow pipe. At this time, oil is continuously fed into the transformer box to increase the internal pressure, and then the pressure is maintained for a certain period of time and the change of the pressure indication number is observed, so as to judge whether the transformer box is leaking;

[0003] In the above patent document, when closing the transformer pressure test port, a threaded structure is used to tighten it to seal it. This process is slow and not very convenient. At the same time, the test is completely dependent on the change in the pressure gauge reading. If the pressure gauge is damaged, it may cause errors in the transformer box test. Utility Model Content

[0004] The purpose of the utility model is to provide a leakage testing device for transformer production in order to solve the above problems.

[0005] The utility model achieves the above-mentioned purpose through the following technical solutions:

[0006] A leakage test device for transformer production, comprising an oil inlet mechanism for supplying insulating oil into a transformer box, a pressure gauge for detecting the oil pressure in the transformer box being arranged at the rear side of the oil inlet mechanism, and a sealing mechanism for sealing a pressure test port of the transformer box, an oil outlet mechanism being arranged on the sealing mechanism, and the oil outlet mechanism and the oil inlet mechanism being arranged symmetrically;

[0007] The sealing mechanism comprises a sealing disk, a sliding hole and a through hole are provided at the top of the sealing disk, an air guide elbow is installed between the sliding hole and the through hole, the lower end of the air guide elbow is located inside the sealing disk, and a straight conduit is provided in the middle of the air guide elbow, a first sealing air bag is provided inside the sliding hole and the through hole, and a second sealing air bag is sleeved on the outside of the sealing disk;

[0008] The oil outlet mechanism comprises a glass tube, which is slidably connected inside the sliding hole, a reducer is fixed on the upper end of the glass tube, an oil outlet valve is fixed on the upper end of the reducer, a conical oil cover is fixed on the lower end of the glass tube, and a float is fixed on the lower end of the conical oil cover.

[0009] Preferably: the inner walls of the sliding hole and the through hole are both provided with grooves for fixing the first sealing airbag, and an air joint is fixed to the upper end of the air guide elbow.

[0010] Preferably, the air guiding elbow is composed of two straight-through parts and a bent part, the two straight-through parts are respectively connected to the bent parts, and the straight-through conduit is in communication with the bent part.

[0011] Preferably, the lower end of the air guide elbow is connected to the second sealing airbag, a pressure detection hole for installing a pressure gauge is provided on the top of the sealing disk, and both ends of the straight conduit are respectively connected to the two first sealing airbags.

[0012] Preferably, the conical oil cover is connected to the glass tube, and a concave hole connected to the glass tube is provided on the conical surface of the conical oil cover.

[0013] Preferably, the oil inlet mechanism comprises an oil pump connecting pipe, one end of the oil pump connecting pipe is fixed to the oil inlet valve, one end of the oil inlet valve away from the oil pump connecting pipe is fixed to the oil inlet pipe, and the lower end of the oil inlet pipe passes through the inside of the through hole.

[0014] The beneficial effects compared with the prior art are as follows:

[0015] 1. The gap between the oil outlet mechanism and the oil inlet mechanism on the sealing disk is sealed by two first sealing airbags and a second sealing airbag, thereby preventing the leakage of insulating oil;

[0016] 2. Use the float to lift the conical oil cover and the glass tube to gradually extend to the top of the sealing plate, and then observe the oil position in the transformer in real time according to the change in the length of the glass tube;

[0017] 3. After sealing for a certain period of time, determine whether the transformer box is leaking by observing the drop in the insulating oil level in the glass tube and the change in the value on the pressure gauge. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0019] Figure 1 It is a structural schematic diagram of a leakage testing device for transformer production according to the utility model;

[0020] Figure 2 It is a cross-sectional view of a leakage testing device for transformer production according to the utility model;

[0021] Figure 3 This is a partial parts diagram of an oil inlet pipe of a transformer production leakage test device described in the utility model;

[0022] Figure 4This is a partial parts diagram of a sealing disk of a leakage test device for transformer production described in the utility model;

[0023] Figure 5 This is a partial parts diagram of the first sealing airbag of a transformer production leakage test device described in the utility model;

[0024] Figure 6 This is a partial parts diagram of the oil outlet mechanism of a transformer production leakage test device described in the utility model;

[0025] Figure 7 It is a partial cross-sectional view of a pressure detection hole of a leakage test device for transformer production described in the utility model;

[0026] Figure 8 The utility model is a partial cross-sectional view of an oil outlet mechanism of a leakage testing device for transformer production.

[0027] The following are the descriptions of the reference numerals:

[0028] 1. Sealing mechanism; 2. Oil outlet mechanism; 3. Oil inlet mechanism; 4. Pressure gauge; 11. Sealing disk; 12. Sliding hole; 13. Through hole; 14. Pressure detection hole; 15. Straight guide tube; 16. First sealing airbag; 17. Second sealing airbag; 18. Air guide elbow; 19. Air joint; 21. Oil outlet valve; 22. Reducer; 23. Glass tube; 24. Conical oil cover; 25. Float; 31. Oil pump connecting pipe; 32. Oil inlet valve; 33. Oil inlet pipe. DETAILED DESCRIPTION

[0029] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0030] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0031] The utility model is further described below in conjunction with the accompanying drawings:

[0032] like Figure 1-Figure 8 As shown, a leakage test device for transformer production includes an oil inlet mechanism 3 for supplying insulating oil into a transformer box, a pressure gauge 4 for detecting the oil pressure in the transformer box is arranged at the rear side of the oil inlet mechanism 3, and a sealing mechanism 1 for sealing the pressure test port of the transformer box, an oil outlet mechanism 2 is arranged on the sealing mechanism 1, and the oil outlet mechanism 2 is symmetrically arranged with the oil inlet mechanism 3;

[0033] In this embodiment: the sealing mechanism 1 includes a sealing disk 11, a sliding hole 12 and a through hole 13 are provided on the top of the sealing disk 11, an air guide elbow 18 is installed between the sliding hole 12 and the through hole 13, the lower end of the air guide elbow 18 is located inside the sealing disk 11, and a straight conduit 15 is provided in the middle of the air guide elbow 18, a first sealing air bag 16 is provided inside the sliding hole 12 and the through hole 13, a second sealing air bag 17 is sleeved on the outside of the sealing disk 11, the inner walls of the sliding hole 12 and the through hole 13 are provided with grooves for fixing the first sealing air bag 16, an air joint 19 is fixed to the upper end of the air guide elbow 18, the air guide elbow 18 is composed of two straight-through parts and a bent part, the two straight-through parts are respectively connected to the bent part, and the straight conduit 15 is connected to the bent part, and the air guide elbow 18 is connected to the bent part. The straight-through portion at the lower end of the air bend pipe 18 is connected to the second sealing airbag 17. A pressure detection hole 14 for installing a pressure gauge 4 is provided on the top of the sealing disk 11. Both ends of the straight conduit 15 are respectively connected to the two first sealing airbags 16. Compressed air is fed into the air guide bend pipe 18 through the air joint 19. The compressed air is fed into the two first sealing airbags 16 and the second sealing airbag 17 through the air guide bend pipe 18 and the straight conduit 15. Then, the gaps between the sliding hole 12 and the oil outlet mechanism 2 and the gaps between the through hole 13 and the oil inlet mechanism 3 are respectively closed through the two first sealing airbags 16. At the same time, the gap between the sealing disk 11 and the pressure measuring port of the transformer box is closed by the second sealing airbag 17, so that the entire device can be quickly closed.

[0034] In this embodiment: the oil outlet mechanism 2 includes a glass tube 23, the glass tube 23 is slidably connected inside the sliding hole 12, a reducer 22 is fixed to the upper end of the glass tube 23, an oil outlet valve 21 is fixed to the upper end of the reducer 22, a conical oil cover 24 is fixed to the lower end of the glass tube 23, a float 25 is fixed to the lower end of the conical oil cover 24, the conical oil cover 24 is communicated with the glass tube 23, a concave hole connected with the glass tube 23 is opened on the conical surface of the conical oil cover 24, the float 25 is used to float on the insulating oil, and the conical oil cover 24 and the glass tube 23 are extended upward by the buoyancy of the float 25, and when the oil is full, the insulating oil can be introduced into the glass tube 23 through the conical oil cover 24 to observe the oil level.

[0035] In this embodiment: the oil inlet mechanism 3 includes an oil pump connecting pipe 31, one end of the oil pump connecting pipe 31 is fixed on the oil inlet valve 32, and the end of the oil inlet valve 32 away from the oil pump connecting pipe 31 is fixed on the oil inlet pipe 33, and the lower end of the oil inlet pipe 33 passes through the inside of the through hole 13. The oil pump connecting pipe 31 and the oil pump are used to deliver the insulating oil in the oil tank to the oil inlet valve 32, and the insulating oil is delivered into the transformer box through the oil inlet valve 32 and the oil inlet pipe 33, and then the transformer box is filled with insulating oil.

[0036] Working principle: When in use, first close the other openings of the transformer box, then place the entire device at the pressure measuring port of the transformer box, then connect the oil pump connecting pipe 31 to the oil pump, and pump the insulating oil in the oil tank to the oil inlet pipe 33 through the oil pump, and then send the insulating oil into the transformer box through the oil inlet pipe 33. At this time, as the oil in the transformer box increases, the float 25 will hold the glass tube 23 and the conical oil cover 24 and float on the oil surface. At this time, as the oil level rises, the conical oil cover 24 and the glass tube 23 will extend upward from the slide hole 12;

[0037] When the glass tube 23 no longer moves upward, the air connector 19 is connected to the compressed air source, and then the air connector 19 sends the compressed air into the air guide elbow 18, and then the compressed air is sent into the two first sealing air bags 16 and the second sealing air bags 17 through the air guide elbow 18 and the straight conduit 15, respectively, and the two first sealing air bags 16 are used to expand to seal the gaps between the sliding hole 12, the oil inlet pipe 33 and the through hole 13, and the glass tube 23, and the expanded second sealing air bag 17 is used to seal the gap between the sealing disk 11 and the transformer box pressure measuring hole, and then the entire transformer box is tested for leakage;

[0038] As the oil pump continuously supplies insulating oil into the transformer box, the insulating oil will enter the transparent glass tube 23 through the concave hole of the conical oil cover 24, and the insulating oil level in the glass tube 23 is higher than the sealing disk 11, and then the oil outlet valve 21 is closed. At this time, the pressure in the entire transformer box continues to rise and will be displayed on the pressure gauge 4;

[0039] When the pressure in the transformer box reaches a certain value, the oil pump is stopped and the oil inlet valve 32 is closed and maintained for a certain period of time. After a certain period of time, the transformer box can be detected to see if it is leaking by observing the value change of the pressure gauge 4. In addition, the insulating oil level in the glass tube 23 can be observed to see if the transformer box is leaking.

[0040] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, and these changes and improvements fall within the scope of the utility model to be protected.

Claims

1. A leakage test device for transformer production, comprising an oil inlet mechanism (3) for supplying insulating oil into a transformer box, a pressure gauge (4) for detecting the oil pressure in the transformer box being arranged at the rear side of the oil inlet mechanism (3), characterized in that: It also comprises a sealing mechanism (1) for sealing the pressure test port of the transformer box, an oil outlet mechanism (2) being arranged on the sealing mechanism (1), and the oil outlet mechanism (2) and the oil inlet mechanism (3) being arranged symmetrically; The sealing mechanism (1) comprises a sealing disk (11), a sliding hole (12) and a through hole (13) are provided on the top of the sealing disk (11), an air guide bend (18) is installed between the sliding hole (12) and the through hole (13), the lower end of the air guide bend (18) is located inside the sealing disk (11), and a straight conduit (15) is provided in the middle of the air guide bend (18), a first sealing air bag (16) is provided inside the sliding hole (12) and the through hole (13), and a second sealing air bag (17) is sleeved on the outside of the sealing disk (11); The oil outlet mechanism (2) comprises a glass tube (23), the glass tube (23) being slidably connected inside the sliding hole (12), a reducing joint (22) being fixed to the upper end of the glass tube (23), an oil outlet valve (21) being fixed to the upper end of the reducing joint (22), a conical oil cover (24) being fixed to the lower end of the glass tube (23), and a float (25) being fixed to the lower end of the conical oil cover (24).

2. A transformer production leakage test device according to claim 1, characterized in that: The inner walls of the sliding hole (12) and the through hole (13) are both provided with grooves for fixing the first sealing airbag (16), and an air joint (19) is fixed to the upper end of the air guide elbow (18).

3. A transformer production leakage test device according to claim 1, characterized in that: The air guide elbow (18) consists of two straight portions and a bent portion, the two straight portions are respectively connected to the bent portions, and the straight conduit (15) is in communication with the bent portion.

4. A transformer production leakage test device according to claim 1, characterized in that: The lower end of the air guide elbow (18) is connected to the second sealing airbag (17), the top of the sealing disk (11) is provided with a pressure detection hole (14) for installing the pressure gauge (4), and the two ends of the straight conduit (15) are respectively connected to the two first sealing airbags (16).

5. A transformer production leakage test device according to claim 1, characterized in that: The conical oil cover (24) is in communication with the glass tube (23), and a concave hole in communication with the glass tube (23) is provided on the conical surface of the conical oil cover (24).

6. A transformer production leakage test device according to claim 1, characterized in that: The oil inlet mechanism (3) comprises an oil pump connecting pipe (31), one end of the oil pump connecting pipe (31) is fixed to an oil inlet valve (32), one end of the oil inlet valve (32) away from the oil pump connecting pipe (31) is fixed to an oil inlet pipe (33), and the lower end of the oil inlet pipe (33) passes through the inside of the through hole (13).

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